Toolholder



Sept. 28, 1948.

H. L. THOMPSON ET AL TOOLHOLDER Filed June '7, 1945 ummn INVENTORS 'HAROL.D LJHOMPSON BY NATHANIEL Kma- Mfiy; w

Patented'Sept. 28, 1948 Harold L. Thompson,

Fitchbiil". Mall" as! Athol, and Nathaniel King,

ignors to ATF Incorporated, a corporation of New Jersey Application June '1, 1945, Serial No. 591,984

' Claims.

This invention relates to a new and improved tool holder having improved means for adjustabiy holding and backing up the tool bit, the construction being particularly applicable for holding Carboloy tips.

Objects of the invention include the provision of a tool holder having improved means for holding down a tool bit such as a Carboloy tip and including a backing. up device which is adjustable so that as the tool bit is ground for sharpening, the backing up device may be moved forward, backing up the tip; the provision of a tool holder as above stated in which the'backing up device comprises a plate adiustably secured to the tool holder in operative position to the tool bit and including means forcing the tool bit against a side wall of the tool holder so that the bit cannot kick out laterally, or become displaced in any direction.

Further objects of the invention include the provision of a tool holder as above stated including interengaging serrated means between the backing up plate and the tool holder for adjustably backing up and positively locking the former, in combination with means clamping the backing up plate to the tool holder; and as a modificationthereof, the invention contemplates the use of means for adjusting and locking the backing up plate in the absence of the serrations.

Other objects and advantages of the invention I will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. 1 is a top plan view of a bodying the present invention;

tool holder emcontemplates an elongated tool holder shank II which may be provided with a top surface l2 and including a cut-away portion forming a provided with a serrated -4. The underside of plate 26 is provided Fig. 2 is a broken away view similar to Fig. 1

but showing a modification thereof;

Fig. 3 is a view in end elevation of the holders of Fig. 1 and Fig. 2;

Fig. 4 is a view in side holder.

In the use of special tool steel bits such as Carboioy tips, it has been found to be a problem to provide a satisfactory holder. The present invention provides a special holder to receive any type of tool bit which may be ground in special elevation of the tool -fixtures and stocked so that tips of various conflgurations are immediately available for use in the holder. In the use of the present device, the tips and also the tool holders find increased use and length of life due to the construction of the' new holder, and the present invention eliminates brazing of the tips to the holder so thatthe holder itself need not be ground back.

As illustrated in the drawings, the invention side .wall at It, said cutaway portion 24 being of less than the full width of theshank at the end thereof and thus defining a projection with a top surface II, a side wall abutment i4, and a side wall ll opposite thereto.

A clamp it is provided for holding the tool bit it down against the tool holder and this clamp may be provided with a fastener such as a machine screw 20 threaded into the tool holder as shown. Clamp i8 is easily loosened for adjustment of the bit l6 along the side wall It. The clamp it may be provided with a flange l8 extending part way down over the side wall I! opposite the side wall II. In this way rotation of the clamp I8 is prevented.

To the rear of the clamp it the shank I0 is top surface 22 located in a cut-away portion 24 receiving a tool backing up plate It. The plate 28 is provided with a thru slot 28 in which is located a screw 30 taking into the shank ll as clearly shown in Fig.

serrations complementary to the serrated surface 22 and thus it will be clear that the backing up plate 28 may be longitudinally adjustable by sufliciently to allow dismovement to a diiferent loosening the screw 30 engasement'thereof and position.

The top surfaces of the tool bit, the backing up plate, and the shank may all be in the same plane. 7

'It' is pointed out that the present construction is equally applicable to right or left hand tools as desired and the invention contemplates construction for both right and left hand tool holders.

This invention provides a tool holder for accommodating removable and replaceable tool bits which will have long usefulness due to the fact that they may be reground a great many times before discarding, and the removable tips are easily adjusted and replaced. It is also to be noted that the tips themselves maybe ground without grinding the tool holder so that the holder itself has a longer life than holders in which the tips are brazed. The tips will be plane with 3 ited to the details herein disclosed. otherwise than as set f h in the claims, but what we claim is:

1. A t l holder. comprising-an elongated shank having a cutaway portion defining a projection at one end thereof and providing a tool bit supporting surface and a side wall abutment for the tool hit, an adjustable screw-held backing-up plate arranged on said shank for endwise abutment of the tool bit, and a screw clamp arranged on said projection and having a flange extending along and over the side of said projection op- .posite the said'side wall, said screw clamp being adapted to maintain a tool bit in operative cutting positionin the tool holder in abutment with said backing-up plate and side wall.

2. A tool holder comprising an elongated shank having a cutaway portion defining a projection at one end thereof and providing a tool bit supporting'surface and a side wall abutment for the tool bit, anadjustable screw-held backing-up plate arranged onsaid shank for endwise abutment of the tool bit, said backing-up plate having serrations on its underface, serrations on the surface of the shank receiving the backing-up plateinterfitting with the serrations on the said backing-up plateand a screw clamp arranged on said projection and having a flange extending alongand over the side of said projection opposite the said side wall, said screw clampwbeing adapted to maintain a tool bit in operative .cuttingposition in thetoolholder in abutment with said backing-up plate and side wall. 1 3. A tool holder comprising an elongated shan 5. A tool holder comprising an elongated shank having a tool bit supporting surface thereon. a

ment of the tool bit.

having a portion cut away from the top surface thereof at one endfithe cutaway portion bein of less than the full width of the shank at one portion thereof vand thus defining a-tool bit supporting surface and a projecting portion, a side wall of which adjacent the said surface provides a side wall abutment. for a tool bit, a screw clamp mounted and supported on said projection and adapted to maintain a tool bit in operative cutting position against the said tool bit sup'porting surface and side wall, and an adjustable screw-held backing-up plate arranged on said 5 shank for endwise abutment of the tool bit.

side wall for abutment of the tool bit, a screw.

clamp adapted to maintain a tool bit in operative cutting position in the tool holder in abutment with said tool bit supporting surface and side wall, and an adjustable screw-held backing-up plate arranged on said shank for endwise abut- HAROLD L. momsou. NATHANIEL xma.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,192,110 Pilkington July 25, 1918 1,346,056 Poulain -41.. July 6, 1920 1,793,564 Bevel-son Feb. 24, 1931 2,169,482 West Aug. 15, 1939 FOREIGN PATENTS Number Country Date 454,340 Great Britain Sept. 29, 1936 OTHER REFERENCES American Machinist, May 1, 1924. "An Eco- ;iqomical Toolholder. by F. L- Lewis, volume 60, 

